Clean-up: sessiond: identation fix
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
CommitLineData
826d496d 1/*
ab5be9fa
MJ
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
fac6795d 5 *
ab5be9fa 6 * SPDX-License-Identifier: GPL-2.0-only
91d76f53 7 *
fac6795d
DG
8 */
9
6c1c0768 10#define _LGPL_SOURCE
fac6795d
DG
11#include <getopt.h>
12#include <grp.h>
13#include <limits.h>
0bb7724a 14#include <paths.h>
fac6795d
DG
15#include <pthread.h>
16#include <signal.h>
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
331744e3 20#include <inttypes.h>
0fdd1e2c 21#include <sys/mman.h>
b73401da 22#include <sys/mount.h>
1e307fab 23#include <sys/resource.h>
fac6795d
DG
24#include <sys/socket.h>
25#include <sys/stat.h>
26#include <sys/types.h>
0fdd1e2c 27#include <sys/wait.h>
5c827ce0 28#include <urcu/uatomic.h>
fac6795d 29#include <unistd.h>
4f0b90ee 30#include <ctype.h>
fac6795d 31
990570ed 32#include <common/common.h>
d27c42b8 33#include <common/compat/socket.h>
e8fa9fb0 34#include <common/compat/getenv.h>
db758600
DG
35#include <common/defaults.h>
36#include <common/kernel-consumer/kernel-consumer.h>
50c8f484 37#include <common/futex.h>
00e2e675 38#include <common/relayd/relayd.h>
81b86775 39#include <common/utils.h>
3ccdf997 40#include <common/daemonize.h>
f40ef1d5 41#include <common/config/session-config.h>
dcabc190 42#include <common/dynamic-buffer.h>
76fcf151 43#include <lttng/event-internal.h>
fac6795d 44
10a8a223 45#include "lttng-sessiond.h"
7972aab2 46#include "buffer-registry.h"
54d01ffb 47#include "channel.h"
2f77fc4b 48#include "cmd.h"
00e2e675 49#include "consumer.h"
099e26bd 50#include "context.h"
54d01ffb 51#include "event.h"
90aa04a1 52#include "event-notifier-error-accounting.h"
4771f025 53#include "kernel.h"
f1e16794 54#include "kernel-consumer.h"
75018ab6 55#include "lttng-ust-ctl.h"
00e2e675 56#include "ust-consumer.h"
8e68d1c8 57#include "utils.h"
4063050c 58#include "fd-limit.h"
8782cc74 59#include "health-sessiond.h"
8ac94142 60#include "testpoint.h"
f9d2ba6a 61#include "notify-apps.h"
022d91ba 62#include "agent-thread.h"
fb198a11 63#include "save.h"
b3530820
JG
64#include "notification-thread.h"
65#include "notification-thread-commands.h"
db66e574 66#include "rotation-thread.h"
7c1d2758 67#include "agent.h"
5e97de00 68#include "ht-cleanup.h"
e6142f2e 69#include "sessiond-config.h"
8e319828 70#include "timer.h"
a3707772 71#include "thread.h"
917a718d 72#include "client.h"
5d1b0219 73#include "dispatch.h"
1785d7f2 74#include "register.h"
7649924e 75#include "manage-apps.h"
5b093681 76#include "manage-kernel.h"
1d25334c 77#include "modprobe.h"
ebaeda94 78
4fc83d94
PP
79static const char *help_msg =
80#ifdef LTTNG_EMBED_HELP
81#include <lttng-sessiond.8.h>
82#else
83NULL
84#endif
85;
86
90aa04a1 87#define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535
761ffce2
FD
88#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR \
89 "event-notifier-error-buffer-size"
90#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \
91 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel"
92#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \
93 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace"
94
90aa04a1 95
fac6795d 96const char *progname;
c9cb3e7d 97static int lockfile_fd = -1;
a3bc3918 98static int opt_print_version;
3bd1e081 99
0bb7724a
DG
100/* Set to 1 when a SIGUSR1 signal is received. */
101static int recv_child_signal;
102
26296c48
JG
103/* Command line options */
104static const struct option long_options[] = {
0f5ea17c
JG
105 { "client-sock", required_argument, 0, 'c' },
106 { "apps-sock", required_argument, 0, 'a' },
107 { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
108 { "kconsumerd-err-sock", required_argument, 0, '\0' },
109 { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
110 { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
111 { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
112 { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
113 { "consumerd32-path", required_argument, 0, '\0' },
114 { "consumerd32-libdir", required_argument, 0, '\0' },
115 { "consumerd64-path", required_argument, 0, '\0' },
116 { "consumerd64-libdir", required_argument, 0, '\0' },
117 { "daemonize", no_argument, 0, 'd' },
118 { "background", no_argument, 0, 'b' },
119 { "sig-parent", no_argument, 0, 'S' },
120 { "help", no_argument, 0, 'h' },
121 { "group", required_argument, 0, 'g' },
122 { "version", no_argument, 0, 'V' },
123 { "quiet", no_argument, 0, 'q' },
124 { "verbose", no_argument, 0, 'v' },
125 { "verbose-consumer", no_argument, 0, '\0' },
126 { "no-kernel", no_argument, 0, '\0' },
127 { "pidfile", required_argument, 0, 'p' },
128 { "agent-tcp-port", required_argument, 0, '\0' },
129 { "config", required_argument, 0, 'f' },
130 { "load", required_argument, 0, 'l' },
131 { "kmod-probes", required_argument, 0, '\0' },
132 { "extra-kmod-probes", required_argument, 0, '\0' },
761ffce2
FD
133 { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, required_argument, 0, '\0' },
134 { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, required_argument, 0, '\0' },
26296c48
JG
135 { NULL, 0, 0, 0 }
136};
137
138/* Command line options to ignore from configuration file */
139static const char *config_ignore_options[] = { "help", "version", "config" };
1d4b027a 140
099e26bd
DG
141/*
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
144 */
76d7553f 145static int apps_cmd_pipe[2] = { -1, -1 };
971a61c6 146static int apps_cmd_notify_pipe[2] = { -1, -1 };
099e26bd 147
099e26bd
DG
148/*
149 * UST registration command queue. This queue is tied with a futex and uses a N
150 * wakers / 1 waiter implemented and detailed in futex.c/.h
151 *
b22c5da8
DG
152 * The thread_registration_apps and thread_dispatch_ust_registration uses this
153 * queue along with the wait/wake scheme. The thread_manage_apps receives down
154 * the line new application socket and monitors it for any I/O error or clean
155 * close that triggers an unregistration of the application.
099e26bd
DG
156 */
157static struct ust_cmd_queue ust_cmd_queue;
158
97bc1426 159/*
a7333da7 160 * Section name to look for in the daemon configuration file.
97bc1426 161 */
a7333da7 162static const char * const config_section_name = "sessiond";
5e97de00 163
a7333da7
JG
164/* Am I root or not. Set to 1 if the daemon is running as root */
165static int is_root;
5eb91c98 166
099e26bd
DG
167/*
168 * Stop all threads by closing the thread quit pipe.
169 */
cf3af59e
MD
170static void stop_threads(void)
171{
5eb91c98
DG
172 int ret;
173
cf3af59e
MD
174 /* Stopping all threads */
175 DBG("Terminating all threads");
a7333da7 176 ret = sessiond_notify_quit_pipe();
5eb91c98
DG
177 if (ret < 0) {
178 ERR("write error on thread quit pipe");
179 }
cf3af59e
MD
180}
181
e975f9f8
DG
182/*
183 * Close every consumer sockets.
184 */
185static void close_consumer_sockets(void)
186{
187 int ret;
188
412d7227
SM
189 if (the_kconsumer_data.err_sock >= 0) {
190 ret = close(the_kconsumer_data.err_sock);
e975f9f8
DG
191 if (ret < 0) {
192 PERROR("kernel consumer err_sock close");
193 }
194 }
412d7227
SM
195 if (the_ustconsumer32_data.err_sock >= 0) {
196 ret = close(the_ustconsumer32_data.err_sock);
e975f9f8 197 if (ret < 0) {
a76cbd9f 198 PERROR("UST consumerd32 err_sock close");
e975f9f8
DG
199 }
200 }
412d7227
SM
201 if (the_ustconsumer64_data.err_sock >= 0) {
202 ret = close(the_ustconsumer64_data.err_sock);
e975f9f8 203 if (ret < 0) {
a76cbd9f 204 PERROR("UST consumerd64 err_sock close");
e975f9f8
DG
205 }
206 }
412d7227
SM
207 if (the_kconsumer_data.cmd_sock >= 0) {
208 ret = close(the_kconsumer_data.cmd_sock);
e975f9f8
DG
209 if (ret < 0) {
210 PERROR("kernel consumer cmd_sock close");
211 }
212 }
412d7227
SM
213 if (the_ustconsumer32_data.cmd_sock >= 0) {
214 ret = close(the_ustconsumer32_data.cmd_sock);
e975f9f8 215 if (ret < 0) {
a76cbd9f 216 PERROR("UST consumerd32 cmd_sock close");
e975f9f8
DG
217 }
218 }
412d7227
SM
219 if (the_ustconsumer64_data.cmd_sock >= 0) {
220 ret = close(the_ustconsumer64_data.cmd_sock);
e975f9f8 221 if (ret < 0) {
a76cbd9f 222 PERROR("UST consumerd64 cmd_sock close");
e975f9f8
DG
223 }
224 }
412d7227
SM
225 if (the_kconsumer_data.channel_monitor_pipe >= 0) {
226 ret = close(the_kconsumer_data.channel_monitor_pipe);
b3530820
JG
227 if (ret < 0) {
228 PERROR("kernel consumer channel monitor pipe close");
229 }
230 }
412d7227
SM
231 if (the_ustconsumer32_data.channel_monitor_pipe >= 0) {
232 ret = close(the_ustconsumer32_data.channel_monitor_pipe);
b3530820
JG
233 if (ret < 0) {
234 PERROR("UST consumerd32 channel monitor pipe close");
235 }
236 }
412d7227
SM
237 if (the_ustconsumer64_data.channel_monitor_pipe >= 0) {
238 ret = close(the_ustconsumer64_data.channel_monitor_pipe);
b3530820
JG
239 if (ret < 0) {
240 PERROR("UST consumerd64 channel monitor pipe close");
241 }
242 }
e975f9f8
DG
243}
244
4e4714cb
JR
245/*
246 * Wait on consumer process termination.
247 *
248 * Need to be called with the consumer data lock held or from a context
249 * ensuring no concurrent access to data (e.g: cleanup).
250 */
251static void wait_consumer(struct consumer_data *consumer_data)
252{
253 pid_t ret;
254 int status;
255
256 if (consumer_data->pid <= 0) {
257 return;
258 }
259
260 DBG("Waiting for complete teardown of consumerd (PID: %d)",
261 consumer_data->pid);
262 ret = waitpid(consumer_data->pid, &status, 0);
263 if (ret == -1) {
264 PERROR("consumerd waitpid pid: %d", consumer_data->pid)
1640c24c 265 } else if (!WIFEXITED(status)) {
4e4714cb
JR
266 ERR("consumerd termination with error: %d",
267 WEXITSTATUS(ret));
268 }
269 consumer_data->pid = 0;
270}
271
fac6795d 272/*
4a15001e 273 * Cleanup the session daemon's data structures.
fac6795d 274 */
4a15001e 275static void sessiond_cleanup(void)
fac6795d 276{
ef599319 277 int ret;
e32d7f27 278 struct ltt_session_list *session_list = session_get_list();
fac6795d 279
4a15001e 280 DBG("Cleanup sessiond");
e07ae692 281
4e449f3f
MD
282 /*
283 * Close the thread quit pipe. It has already done its job,
284 * since we are now called.
285 */
a7333da7 286 sessiond_close_quit_pipe();
971a61c6
JG
287 utils_close_pipe(apps_cmd_pipe);
288 utils_close_pipe(apps_cmd_notify_pipe);
412d7227 289 utils_close_pipe(the_kernel_poll_pipe);
2f77fc4b 290
412d7227 291 ret = remove(the_config.pid_file_path.value);
c9a2957d 292 if (ret < 0) {
412d7227 293 PERROR("remove pidfile %s", the_config.pid_file_path.value);
35f90c40
DG
294 }
295
e6142f2e 296 DBG("Removing sessiond and consumerd content of directory %s",
412d7227 297 the_config.rundir.value);
8c6c56c2
MD
298
299 /* sessiond */
412d7227
SM
300 DBG("Removing %s", the_config.pid_file_path.value);
301 (void) unlink(the_config.pid_file_path.value);
8c6c56c2 302
412d7227
SM
303 DBG("Removing %s", the_config.agent_port_file_path.value);
304 (void) unlink(the_config.agent_port_file_path.value);
cd9290dd 305
8c6c56c2 306 /* kconsumerd */
412d7227
SM
307 DBG("Removing %s", the_kconsumer_data.err_unix_sock_path);
308 (void) unlink(the_kconsumer_data.err_unix_sock_path);
e6142f2e 309
412d7227
SM
310 DBG("Removing directory %s", the_config.kconsumerd_path.value);
311 (void) rmdir(the_config.kconsumerd_path.value);
8c6c56c2
MD
312
313 /* ust consumerd 32 */
412d7227
SM
314 DBG("Removing %s", the_config.consumerd32_err_unix_sock_path.value);
315 (void) unlink(the_config.consumerd32_err_unix_sock_path.value);
e6142f2e 316
412d7227
SM
317 DBG("Removing directory %s", the_config.consumerd32_path.value);
318 (void) rmdir(the_config.consumerd32_path.value);
8c6c56c2
MD
319
320 /* ust consumerd 64 */
412d7227
SM
321 DBG("Removing %s", the_config.consumerd64_err_unix_sock_path.value);
322 (void) unlink(the_config.consumerd64_err_unix_sock_path.value);
e6142f2e 323
412d7227
SM
324 DBG("Removing directory %s", the_config.consumerd64_path.value);
325 (void) rmdir(the_config.consumerd64_path.value);
5461b305 326
99d688f2 327 pthread_mutex_destroy(&session_list->lock);
273ea72c 328
44760c20
JR
329 DBG("Cleaning up all per-event notifier domain agents");
330 agent_by_event_notifier_domain_ht_destroy();
331
6a4e4039
JG
332 DBG("Cleaning up all agent apps");
333 agent_app_ht_clean();
099e26bd 334 DBG("Closing all UST sockets");
56fff090 335 ust_app_clean_list();
7972aab2 336 buffer_reg_destroy_registries();
099e26bd 337
0787fc4b
MD
338 close_consumer_sockets();
339
412d7227
SM
340 wait_consumer(&the_kconsumer_data);
341 wait_consumer(&the_ustconsumer64_data);
342 wait_consumer(&the_ustconsumer32_data);
0787fc4b 343
412d7227 344 if (is_root && !the_config.no_kernel) {
7d268848 345 cleanup_kernel_tracer();
2f50c8a3 346 }
2f77fc4b 347
c9cb3e7d
JG
348 /*
349 * We do NOT rmdir rundir because there are other processes
350 * using it, for instance lttng-relayd, which can start in
351 * parallel with this teardown.
352 */
4a15001e
MD
353}
354
355/*
356 * Cleanup the daemon's option data structures.
357 */
358static void sessiond_cleanup_options(void)
359{
360 DBG("Cleaning up options");
361
412d7227 362 sessiond_config_fini(&the_config);
c9cb3e7d 363
7567352f 364 run_as_destroy_worker();
fac6795d
DG
365}
366
917a718d 367static int string_match(const char *str1, const char *str2)
54d01ffb 368{
917a718d 369 return (str1 && str2) && !strcmp(str1, str2);
54d01ffb
DG
370}
371
00e2e675 372/*
917a718d
JG
373 * Take an option from the getopt output and set it in the right variable to be
374 * used later.
36b588ed 375 *
917a718d 376 * Return 0 on success else a negative value.
00e2e675 377 */
917a718d 378static int set_option(int opt, const char *arg, const char *optname)
00e2e675 379{
917a718d 380 int ret = 0;
fac6795d 381
c0232ea5 382 if (string_match(optname, "client-sock") || opt == 'c') {
66b2ce8e
JG
383 if (!arg || *arg == '\0') {
384 ret = -EINVAL;
385 goto end;
386 }
e8fa9fb0
MD
387 if (lttng_is_setuid_setgid()) {
388 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
389 "-c, --client-sock");
390 } else {
412d7227 391 config_string_set(&the_config.client_unix_sock_path,
e6142f2e 392 strdup(arg));
412d7227 393 if (!the_config.client_unix_sock_path.value) {
e6142f2e
JG
394 ret = -ENOMEM;
395 PERROR("strdup");
396 }
e8fa9fb0 397 }
c0232ea5 398 } else if (string_match(optname, "apps-sock") || opt == 'a') {
66b2ce8e
JG
399 if (!arg || *arg == '\0') {
400 ret = -EINVAL;
401 goto end;
402 }
e8fa9fb0
MD
403 if (lttng_is_setuid_setgid()) {
404 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
405 "-a, --apps-sock");
406 } else {
412d7227 407 config_string_set(&the_config.apps_unix_sock_path,
e6142f2e 408 strdup(arg));
412d7227 409 if (!the_config.apps_unix_sock_path.value) {
e6142f2e
JG
410 ret = -ENOMEM;
411 PERROR("strdup");
412 }
e8fa9fb0 413 }
c0232ea5 414 } else if (string_match(optname, "daemonize") || opt == 'd') {
412d7227 415 the_config.daemonize = true;
c0232ea5 416 } else if (string_match(optname, "background") || opt == 'b') {
412d7227 417 the_config.background = true;
c0232ea5 418 } else if (string_match(optname, "group") || opt == 'g') {
66b2ce8e
JG
419 if (!arg || *arg == '\0') {
420 ret = -EINVAL;
421 goto end;
422 }
e8fa9fb0
MD
423 if (lttng_is_setuid_setgid()) {
424 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
425 "-g, --group");
426 } else {
412d7227 427 config_string_set(&the_config.tracing_group_name,
e6142f2e 428 strdup(arg));
412d7227 429 if (!the_config.tracing_group_name.value) {
e8fa9fb0 430 ret = -ENOMEM;
e6142f2e 431 PERROR("strdup");
e8fa9fb0 432 }
db322c4d 433 }
c0232ea5 434 } else if (string_match(optname, "help") || opt == 'h') {
4fc83d94 435 ret = utils_show_help(8, "lttng-sessiond", help_msg);
8190767e 436 if (ret) {
4fc83d94 437 ERR("Cannot show --help for `lttng-sessiond`");
8190767e
PP
438 perror("exec");
439 }
440 exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
c0232ea5 441 } else if (string_match(optname, "version") || opt == 'V') {
a3bc3918 442 opt_print_version = 1;
c0232ea5 443 } else if (string_match(optname, "sig-parent") || opt == 'S') {
412d7227 444 the_config.sig_parent = true;
c0232ea5 445 } else if (string_match(optname, "kconsumerd-err-sock")) {
66b2ce8e
JG
446 if (!arg || *arg == '\0') {
447 ret = -EINVAL;
448 goto end;
449 }
e8fa9fb0
MD
450 if (lttng_is_setuid_setgid()) {
451 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
452 "--kconsumerd-err-sock");
453 } else {
412d7227
SM
454 config_string_set(
455 &the_config.kconsumerd_err_unix_sock_path,
e6142f2e 456 strdup(arg));
412d7227 457 if (!the_config.kconsumerd_err_unix_sock_path.value) {
e6142f2e
JG
458 ret = -ENOMEM;
459 PERROR("strdup");
460 }
e8fa9fb0 461 }
c0232ea5 462 } else if (string_match(optname, "kconsumerd-cmd-sock")) {
66b2ce8e
JG
463 if (!arg || *arg == '\0') {
464 ret = -EINVAL;
465 goto end;
466 }
e8fa9fb0
MD
467 if (lttng_is_setuid_setgid()) {
468 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
469 "--kconsumerd-cmd-sock");
470 } else {
412d7227
SM
471 config_string_set(
472 &the_config.kconsumerd_cmd_unix_sock_path,
e6142f2e 473 strdup(arg));
412d7227 474 if (!the_config.kconsumerd_cmd_unix_sock_path.value) {
e6142f2e
JG
475 ret = -ENOMEM;
476 PERROR("strdup");
477 }
e8fa9fb0 478 }
c0232ea5 479 } else if (string_match(optname, "ustconsumerd64-err-sock")) {
66b2ce8e
JG
480 if (!arg || *arg == '\0') {
481 ret = -EINVAL;
482 goto end;
483 }
e8fa9fb0
MD
484 if (lttng_is_setuid_setgid()) {
485 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
486 "--ustconsumerd64-err-sock");
487 } else {
412d7227
SM
488 config_string_set(
489 &the_config.consumerd64_err_unix_sock_path,
e6142f2e 490 strdup(arg));
412d7227 491 if (!the_config.consumerd64_err_unix_sock_path.value) {
e6142f2e
JG
492 ret = -ENOMEM;
493 PERROR("strdup");
494 }
e8fa9fb0 495 }
c0232ea5 496 } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
66b2ce8e
JG
497 if (!arg || *arg == '\0') {
498 ret = -EINVAL;
499 goto end;
500 }
e8fa9fb0
MD
501 if (lttng_is_setuid_setgid()) {
502 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
503 "--ustconsumerd64-cmd-sock");
504 } else {
412d7227
SM
505 config_string_set(
506 &the_config.consumerd64_cmd_unix_sock_path,
e6142f2e 507 strdup(arg));
412d7227 508 if (!the_config.consumerd64_cmd_unix_sock_path.value) {
e6142f2e
JG
509 ret = -ENOMEM;
510 PERROR("strdup");
511 }
e8fa9fb0 512 }
c0232ea5 513 } else if (string_match(optname, "ustconsumerd32-err-sock")) {
66b2ce8e
JG
514 if (!arg || *arg == '\0') {
515 ret = -EINVAL;
516 goto end;
517 }
e8fa9fb0
MD
518 if (lttng_is_setuid_setgid()) {
519 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
520 "--ustconsumerd32-err-sock");
521 } else {
412d7227
SM
522 config_string_set(
523 &the_config.consumerd32_err_unix_sock_path,
e6142f2e 524 strdup(arg));
412d7227 525 if (!the_config.consumerd32_err_unix_sock_path.value) {
e6142f2e
JG
526 ret = -ENOMEM;
527 PERROR("strdup");
528 }
e8fa9fb0 529 }
c0232ea5 530 } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
66b2ce8e
JG
531 if (!arg || *arg == '\0') {
532 ret = -EINVAL;
533 goto end;
534 }
e8fa9fb0
MD
535 if (lttng_is_setuid_setgid()) {
536 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
537 "--ustconsumerd32-cmd-sock");
538 } else {
412d7227
SM
539 config_string_set(
540 &the_config.consumerd32_cmd_unix_sock_path,
e6142f2e 541 strdup(arg));
412d7227 542 if (!the_config.consumerd32_cmd_unix_sock_path.value) {
e6142f2e
JG
543 ret = -ENOMEM;
544 PERROR("strdup");
545 }
e8fa9fb0 546 }
c0232ea5 547 } else if (string_match(optname, "no-kernel")) {
412d7227 548 the_config.no_kernel = true;
c0232ea5 549 } else if (string_match(optname, "quiet") || opt == 'q') {
412d7227 550 the_config.quiet = true;
c0232ea5 551 } else if (string_match(optname, "verbose") || opt == 'v') {
26296c48
JG
552 /* Verbose level can increase using multiple -v */
553 if (arg) {
13755a18 554 /* Value obtained from config file */
412d7227 555 the_config.verbose = config_parse_value(arg);
26296c48 556 } else {
13755a18 557 /* -v used on command line */
412d7227 558 the_config.verbose++;
26296c48 559 }
13755a18 560 /* Clamp value to [0, 3] */
412d7227
SM
561 the_config.verbose = the_config.verbose < 0 ?
562 0 :
563 (the_config.verbose <= 3 ? the_config.verbose :
564 3);
c0232ea5 565 } else if (string_match(optname, "verbose-consumer")) {
26296c48 566 if (arg) {
412d7227 567 the_config.verbose_consumer = config_parse_value(arg);
26296c48 568 } else {
412d7227 569 the_config.verbose_consumer++;
26296c48 570 }
c0232ea5 571 } else if (string_match(optname, "consumerd32-path")) {
66b2ce8e
JG
572 if (!arg || *arg == '\0') {
573 ret = -EINVAL;
574 goto end;
575 }
e8fa9fb0
MD
576 if (lttng_is_setuid_setgid()) {
577 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
578 "--consumerd32-path");
579 } else {
412d7227 580 config_string_set(&the_config.consumerd32_bin_path,
e6142f2e 581 strdup(arg));
412d7227 582 if (!the_config.consumerd32_bin_path.value) {
e8fa9fb0
MD
583 PERROR("strdup");
584 ret = -ENOMEM;
585 }
db322c4d 586 }
c0232ea5 587 } else if (string_match(optname, "consumerd32-libdir")) {
66b2ce8e
JG
588 if (!arg || *arg == '\0') {
589 ret = -EINVAL;
590 goto end;
591 }
e8fa9fb0
MD
592 if (lttng_is_setuid_setgid()) {
593 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
594 "--consumerd32-libdir");
595 } else {
412d7227 596 config_string_set(&the_config.consumerd32_lib_dir,
e6142f2e 597 strdup(arg));
412d7227 598 if (!the_config.consumerd32_lib_dir.value) {
e8fa9fb0
MD
599 PERROR("strdup");
600 ret = -ENOMEM;
601 }
db322c4d 602 }
c0232ea5 603 } else if (string_match(optname, "consumerd64-path")) {
66b2ce8e
JG
604 if (!arg || *arg == '\0') {
605 ret = -EINVAL;
606 goto end;
607 }
e8fa9fb0
MD
608 if (lttng_is_setuid_setgid()) {
609 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
610 "--consumerd64-path");
611 } else {
412d7227 612 config_string_set(&the_config.consumerd64_bin_path,
e6142f2e 613 strdup(arg));
412d7227 614 if (!the_config.consumerd64_bin_path.value) {
e8fa9fb0
MD
615 PERROR("strdup");
616 ret = -ENOMEM;
617 }
db322c4d 618 }
c0232ea5 619 } else if (string_match(optname, "consumerd64-libdir")) {
66b2ce8e
JG
620 if (!arg || *arg == '\0') {
621 ret = -EINVAL;
622 goto end;
623 }
e8fa9fb0
MD
624 if (lttng_is_setuid_setgid()) {
625 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
626 "--consumerd64-libdir");
627 } else {
412d7227 628 config_string_set(&the_config.consumerd64_lib_dir,
e6142f2e 629 strdup(arg));
412d7227 630 if (!the_config.consumerd64_lib_dir.value) {
e8fa9fb0
MD
631 PERROR("strdup");
632 ret = -ENOMEM;
633 }
db322c4d 634 }
c0232ea5 635 } else if (string_match(optname, "pidfile") || opt == 'p') {
66b2ce8e
JG
636 if (!arg || *arg == '\0') {
637 ret = -EINVAL;
638 goto end;
639 }
e8fa9fb0
MD
640 if (lttng_is_setuid_setgid()) {
641 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
642 "-p, --pidfile");
643 } else {
412d7227
SM
644 config_string_set(
645 &the_config.pid_file_path, strdup(arg));
646 if (!the_config.pid_file_path.value) {
e8fa9fb0
MD
647 PERROR("strdup");
648 ret = -ENOMEM;
649 }
db322c4d 650 }
c0232ea5 651 } else if (string_match(optname, "agent-tcp-port")) {
66b2ce8e
JG
652 if (!arg || *arg == '\0') {
653 ret = -EINVAL;
654 goto end;
655 }
e8fa9fb0
MD
656 if (lttng_is_setuid_setgid()) {
657 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
658 "--agent-tcp-port");
659 } else {
660 unsigned long v;
4d076222 661
e8fa9fb0
MD
662 errno = 0;
663 v = strtoul(arg, NULL, 0);
664 if (errno != 0 || !isdigit(arg[0])) {
665 ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
666 return -1;
667 }
668 if (v == 0 || v >= 65535) {
669 ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
670 return -1;
671 }
412d7227
SM
672 the_config.agent_tcp_port.begin =
673 the_config.agent_tcp_port.end = (int) v;
2288467f 674 DBG3("Agent TCP port set to non default: %i", (int) v);
26296c48 675 }
c0232ea5 676 } else if (string_match(optname, "load") || opt == 'l') {
66b2ce8e
JG
677 if (!arg || *arg == '\0') {
678 ret = -EINVAL;
679 goto end;
680 }
e8fa9fb0
MD
681 if (lttng_is_setuid_setgid()) {
682 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
683 "-l, --load");
684 } else {
412d7227
SM
685 config_string_set(&the_config.load_session_path,
686 strdup(arg));
687 if (!the_config.load_session_path.value) {
e8fa9fb0
MD
688 PERROR("strdup");
689 ret = -ENOMEM;
690 }
ef367a93 691 }
c0232ea5 692 } else if (string_match(optname, "kmod-probes")) {
66b2ce8e
JG
693 if (!arg || *arg == '\0') {
694 ret = -EINVAL;
695 goto end;
696 }
e8fa9fb0
MD
697 if (lttng_is_setuid_setgid()) {
698 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
699 "--kmod-probes");
700 } else {
412d7227
SM
701 config_string_set(&the_config.kmod_probes_list,
702 strdup(arg));
703 if (!the_config.kmod_probes_list.value) {
e8fa9fb0
MD
704 PERROR("strdup");
705 ret = -ENOMEM;
706 }
c9d42407 707 }
c0232ea5 708 } else if (string_match(optname, "extra-kmod-probes")) {
66b2ce8e
JG
709 if (!arg || *arg == '\0') {
710 ret = -EINVAL;
711 goto end;
712 }
e8fa9fb0
MD
713 if (lttng_is_setuid_setgid()) {
714 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
715 "--extra-kmod-probes");
716 } else {
412d7227 717 config_string_set(&the_config.kmod_extra_probes_list,
e6142f2e 718 strdup(arg));
412d7227 719 if (!the_config.kmod_extra_probes_list.value) {
e8fa9fb0
MD
720 PERROR("strdup");
721 ret = -ENOMEM;
722 }
db322c4d 723 }
761ffce2 724 } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR)) {
90aa04a1
FD
725 unsigned long v;
726
727 errno = 0;
728 v = strtoul(arg, NULL, 0);
729 if (errno != 0 || !isdigit(arg[0])) {
761ffce2
FD
730 ERR("Wrong value in --%s parameter: %s",
731 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
90aa04a1
FD
732 return -1;
733 }
734 if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
761ffce2
FD
735 ERR("Value out of range for --%s parameter: %s",
736 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
90aa04a1
FD
737 return -1;
738 }
761ffce2
FD
739 the_config.event_notifier_buffer_size_kernel = (int) v;
740 DBG3("Number of event notifier error buffer kernel size to non default: %i",
741 the_config.event_notifier_buffer_size_kernel);
742 goto end;
743 } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR)) {
744 unsigned long v;
745
746 errno = 0;
747 v = strtoul(arg, NULL, 0);
748 if (errno != 0 || !isdigit(arg[0])) {
749 ERR("Wrong value in --%s parameter: %s",
750 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
751 return -1;
752 }
753 if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
754 ERR("Value out of range for --%s parameter: %s",
755 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
756 return -1;
757 }
758 the_config.event_notifier_buffer_size_userspace = (int) v;
759 DBG3("Number of event notifier error buffer userspace size to non default: %i",
760 the_config.event_notifier_buffer_size_userspace);
90aa04a1 761 goto end;
c0232ea5
JG
762 } else if (string_match(optname, "config") || opt == 'f') {
763 /* This is handled in set_options() thus silent skip. */
764 goto end;
765 } else {
26296c48
JG
766 /* Unknown option or other error.
767 * Error is printed by getopt, just return */
768 ret = -1;
769 }
770
f3dd7ce7 771end:
c5d350b2
JG
772 if (ret == -EINVAL) {
773 const char *opt_name = "unknown";
774 int i;
775
776 for (i = 0; i < sizeof(long_options) / sizeof(struct option);
777 i++) {
778 if (opt == long_options[i].val) {
779 opt_name = long_options[i].name;
780 break;
781 }
782 }
783
784 WARN("Invalid argument provided for option \"%s\", using default value.",
785 opt_name);
786 }
f3dd7ce7 787
26296c48
JG
788 return ret;
789}
790
791/*
792 * config_entry_handler_cb used to handle options read from a config file.
f40ef1d5 793 * See config_entry_handler_cb comment in common/config/session-config.h for the
26296c48
JG
794 * return value conventions.
795 */
796static int config_entry_handler(const struct config_entry *entry, void *unused)
797{
798 int ret = 0, i;
799
800 if (!entry || !entry->name || !entry->value) {
801 ret = -EINVAL;
802 goto end;
803 }
804
805 /* Check if the option is to be ignored */
806 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
807 if (!strcmp(entry->name, config_ignore_options[i])) {
808 goto end;
809 }
810 }
811
812 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
813 i++) {
814
815 /* Ignore if not fully matched. */
816 if (strcmp(entry->name, long_options[i].name)) {
817 continue;
818 }
819
820 /*
821 * If the option takes no argument on the command line, we have to
822 * check if the value is "true". We support non-zero numeric values,
823 * true, on and yes.
824 */
825 if (!long_options[i].has_arg) {
826 ret = config_parse_value(entry->value);
827 if (ret <= 0) {
828 if (ret) {
829 WARN("Invalid configuration value \"%s\" for option %s",
830 entry->value, entry->name);
831 }
832 /* False, skip boolean config option. */
833 goto end;
4d076222 834 }
26296c48
JG
835 }
836
837 ret = set_option(long_options[i].val, entry->value, entry->name);
838 goto end;
839 }
840
841 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
842
843end:
844 return ret;
845}
846
a3bc3918
JR
847static void print_version(void) {
848 fprintf(stdout, "%s\n", VERSION);
849}
850
26296c48
JG
851/*
852 * daemon configuration loading and argument parsing
853 */
854static int set_options(int argc, char **argv)
855{
856 int ret = 0, c = 0, option_index = 0;
857 int orig_optopt = optopt, orig_optind = optind;
858 char *optstring;
859 const char *config_path = NULL;
860
861 optstring = utils_generate_optstring(long_options,
862 sizeof(long_options) / sizeof(struct option));
863 if (!optstring) {
864 ret = -ENOMEM;
865 goto end;
866 }
867
868 /* Check for the --config option */
869 while ((c = getopt_long(argc, argv, optstring, long_options,
870 &option_index)) != -1) {
871 if (c == '?') {
872 ret = -EINVAL;
873 goto end;
874 } else if (c != 'f') {
875 /* if not equal to --config option. */
876 continue;
877 }
878
e8fa9fb0
MD
879 if (lttng_is_setuid_setgid()) {
880 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
881 "-f, --config");
882 } else {
883 config_path = utils_expand_path(optarg);
884 if (!config_path) {
885 ERR("Failed to resolve path: %s", optarg);
886 }
26296c48
JG
887 }
888 }
889
890 ret = config_get_section_entries(config_path, config_section_name,
891 config_entry_handler, NULL);
892 if (ret) {
893 if (ret > 0) {
894 ERR("Invalid configuration option at line %i", ret);
895 ret = -1;
896 }
897 goto end;
898 }
899
900 /* Reset getopt's global state */
901 optopt = orig_optopt;
902 optind = orig_optind;
903 while (1) {
c0232ea5
JG
904 option_index = -1;
905 /*
906 * getopt_long() will not set option_index if it encounters a
907 * short option.
908 */
909 c = getopt_long(argc, argv, optstring, long_options,
910 &option_index);
26296c48 911 if (c == -1) {
4d076222
DG
912 break;
913 }
26296c48 914
c0232ea5
JG
915 /*
916 * Pass NULL as the long option name if popt left the index
917 * unset.
918 */
919 ret = set_option(c, optarg,
920 option_index < 0 ? NULL :
921 long_options[option_index].name);
26296c48
JG
922 if (ret < 0) {
923 break;
fac6795d
DG
924 }
925 }
926
26296c48
JG
927end:
928 free(optstring);
929 return ret;
fac6795d
DG
930}
931
f472090a
JG
932/*
933 * Create lockfile using the rundir and return its fd.
934 */
935static int create_lockfile(void)
936{
412d7227 937 return utils_create_lock_file(the_config.lock_file_path.value);
f472090a
JG
938}
939
fac6795d 940/*
54d01ffb
DG
941 * Check if the global socket is available, and if a daemon is answering at the
942 * other side. If yes, error is returned.
f472090a
JG
943 *
944 * Also attempts to create and hold the lock file.
fac6795d 945 */
cf3af59e 946static int check_existing_daemon(void)
fac6795d 947{
f472090a
JG
948 int ret = 0;
949
7d8234d9 950 /* Is there anybody out there ? */
099e26bd 951 if (lttng_session_daemon_alive()) {
f472090a
JG
952 ret = -EEXIST;
953 goto end;
099e26bd 954 }
b09c7c76 955
f472090a
JG
956 lockfile_fd = create_lockfile();
957 if (lockfile_fd < 0) {
958 ret = -EEXIST;
959 goto end;
960 }
961end:
962 return ret;
963}
964
965static void sessiond_cleanup_lock_file(void)
966{
967 int ret;
968
969 /*
970 * Cleanup lock file by deleting it and finaly closing it which will
971 * release the file system lock.
972 */
973 if (lockfile_fd >= 0) {
412d7227 974 ret = remove(the_config.lock_file_path.value);
f472090a
JG
975 if (ret < 0) {
976 PERROR("remove lock file");
977 }
978 ret = close(lockfile_fd);
979 if (ret < 0) {
980 PERROR("close lock file");
981 }
982 }
fac6795d
DG
983}
984
fac6795d 985/*
d063d709 986 * Set the tracing group gid onto the client socket.
5e16da05 987 *
d063d709 988 * Race window between mkdir and chown is OK because we are going from more
d1613cf5 989 * permissive (root.root) to less permissive (root.tracing).
fac6795d 990 */
be040666 991static int set_permissions(char *rundir)
fac6795d
DG
992{
993 int ret;
996b65c8 994 gid_t gid;
fac6795d 995
412d7227
SM
996 ret = utils_get_group_id(
997 the_config.tracing_group_name.value, true, &gid);
28ab59d0
JR
998 if (ret) {
999 /* Default to root group. */
1000 gid = 0;
1001 }
fac6795d 1002
d6f42150 1003 /* Set lttng run dir */
be040666 1004 ret = chown(rundir, 0, gid);
d6f42150 1005 if (ret < 0) {
be040666 1006 ERR("Unable to set group on %s", rundir);
76d7553f 1007 PERROR("chown");
d6f42150
DG
1008 }
1009
6c71277b
MD
1010 /*
1011 * Ensure all applications and tracing group can search the run
1012 * dir. Allow everyone to read the directory, since it does not
1013 * buy us anything to hide its content.
1014 */
1015 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
d1613cf5
JN
1016 if (ret < 0) {
1017 ERR("Unable to set permissions on %s", rundir);
76d7553f 1018 PERROR("chmod");
d1613cf5
JN
1019 }
1020
d6f42150 1021 /* lttng client socket path */
412d7227 1022 ret = chown(the_config.client_unix_sock_path.value, 0, gid);
fac6795d 1023 if (ret < 0) {
412d7227
SM
1024 ERR("Unable to set group on %s",
1025 the_config.client_unix_sock_path.value);
76d7553f 1026 PERROR("chown");
d6f42150
DG
1027 }
1028
3bd1e081 1029 /* kconsumer error socket path */
412d7227 1030 ret = chown(the_kconsumer_data.err_unix_sock_path, 0, 0);
d6f42150 1031 if (ret < 0) {
412d7227
SM
1032 ERR("Unable to set group on %s",
1033 the_kconsumer_data.err_unix_sock_path);
76d7553f 1034 PERROR("chown");
3bd1e081
MD
1035 }
1036
7753dea8 1037 /* 64-bit ustconsumer error socket path */
412d7227 1038 ret = chown(the_ustconsumer64_data.err_unix_sock_path, 0, 0);
7753dea8 1039 if (ret < 0) {
412d7227
SM
1040 ERR("Unable to set group on %s",
1041 the_ustconsumer64_data.err_unix_sock_path);
76d7553f 1042 PERROR("chown");
7753dea8
MD
1043 }
1044
1045 /* 32-bit ustconsumer compat32 error socket path */
412d7227 1046 ret = chown(the_ustconsumer32_data.err_unix_sock_path, 0, 0);
3bd1e081 1047 if (ret < 0) {
412d7227
SM
1048 ERR("Unable to set group on %s",
1049 the_ustconsumer32_data.err_unix_sock_path);
76d7553f 1050 PERROR("chown");
fac6795d
DG
1051 }
1052
d6f42150 1053 DBG("All permissions are set");
e07ae692 1054
fac6795d
DG
1055 return ret;
1056}
1057
d6f42150 1058/*
d063d709 1059 * Create the lttng run directory needed for all global sockets and pipe.
d6f42150 1060 */
e6142f2e 1061static int create_lttng_rundir(void)
d6f42150
DG
1062{
1063 int ret;
1064
412d7227 1065 DBG3("Creating LTTng run directory: %s", the_config.rundir.value);
67e40797 1066
412d7227 1067 ret = mkdir(the_config.rundir.value, S_IRWXU);
d6f42150 1068 if (ret < 0) {
b1f11e69 1069 if (errno != EEXIST) {
412d7227 1070 ERR("Unable to create %s", the_config.rundir.value);
b1f11e69
DG
1071 goto error;
1072 } else {
1073 ret = 0;
1074 }
d6f42150
DG
1075 }
1076
1077error:
1078 return ret;
1079}
1080
1081/*
e6142f2e 1082 * Setup sockets and directory needed by the consumerds' communication with the
d063d709 1083 * session daemon.
d6f42150 1084 */
e6142f2e 1085static int set_consumer_sockets(struct consumer_data *consumer_data)
d6f42150
DG
1086{
1087 int ret;
e6142f2e 1088 char *path = NULL;
d6f42150 1089
6c71277b 1090 switch (consumer_data->type) {
7753dea8 1091 case LTTNG_CONSUMER_KERNEL:
412d7227 1092 path = the_config.kconsumerd_path.value;
7753dea8
MD
1093 break;
1094 case LTTNG_CONSUMER64_UST:
412d7227 1095 path = the_config.consumerd64_path.value;
7753dea8
MD
1096 break;
1097 case LTTNG_CONSUMER32_UST:
412d7227 1098 path = the_config.consumerd32_path.value;
7753dea8
MD
1099 break;
1100 default:
1101 ERR("Consumer type unknown");
1102 ret = -EINVAL;
1103 goto error;
d6f42150 1104 }
e6142f2e 1105 assert(path);
d6f42150 1106
67e40797
DG
1107 DBG2("Creating consumer directory: %s", path);
1108
6c71277b 1109 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
e7e1ef17
JR
1110 if (ret < 0 && errno != EEXIST) {
1111 PERROR("mkdir");
1112 ERR("Failed to create %s", path);
1113 goto error;
d6f42150 1114 }
6c71277b 1115 if (is_root) {
28ab59d0
JR
1116 gid_t gid;
1117
412d7227
SM
1118 ret = utils_get_group_id(the_config.tracing_group_name.value,
1119 true, &gid);
28ab59d0
JR
1120 if (ret) {
1121 /* Default to root group. */
1122 gid = 0;
1123 }
1124
1125 ret = chown(path, 0, gid);
6c71277b
MD
1126 if (ret < 0) {
1127 ERR("Unable to set group on %s", path);
1128 PERROR("chown");
1129 goto error;
1130 }
1131 }
d6f42150 1132
e6142f2e 1133 /* Create the consumerd error unix socket */
3bd1e081
MD
1134 consumer_data->err_sock =
1135 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
1136 if (consumer_data->err_sock < 0) {
1137 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
d6f42150
DG
1138 ret = -1;
1139 goto error;
1140 }
1141
a24f05ab
MD
1142 /*
1143 * Set the CLOEXEC flag. Return code is useless because either way, the
1144 * show must go on.
1145 */
1146 ret = utils_set_fd_cloexec(consumer_data->err_sock);
1147 if (ret < 0) {
1148 PERROR("utils_set_fd_cloexec");
1149 /* continue anyway */
1150 }
1151
d6f42150 1152 /* File permission MUST be 660 */
3bd1e081 1153 ret = chmod(consumer_data->err_unix_sock_path,
54d01ffb 1154 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
d6f42150 1155 if (ret < 0) {
3bd1e081 1156 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
67e40797 1157 PERROR("chmod");
d6f42150
DG
1158 goto error;
1159 }
1160
1161error:
1162 return ret;
1163}
1164
fac6795d 1165/*
d063d709 1166 * Signal handler for the daemon
cf3af59e 1167 *
54d01ffb
DG
1168 * Simply stop all worker threads, leaving main() return gracefully after
1169 * joining all threads and calling cleanup().
fac6795d
DG
1170 */
1171static void sighandler(int sig)
1172{
1173 switch (sig) {
cf3af59e 1174 case SIGINT:
af87c45a 1175 DBG("SIGINT caught");
cf3af59e
MD
1176 stop_threads();
1177 break;
1178 case SIGTERM:
af87c45a 1179 DBG("SIGTERM caught");
cf3af59e
MD
1180 stop_threads();
1181 break;
0bb7724a
DG
1182 case SIGUSR1:
1183 CMM_STORE_SHARED(recv_child_signal, 1);
1184 break;
cf3af59e
MD
1185 default:
1186 break;
fac6795d 1187 }
fac6795d
DG
1188}
1189
1190/*
d063d709 1191 * Setup signal handler for :
1d4b027a 1192 * SIGINT, SIGTERM, SIGPIPE
fac6795d 1193 */
1d4b027a 1194static int set_signal_handler(void)
fac6795d 1195{
1d4b027a
DG
1196 int ret = 0;
1197 struct sigaction sa;
1198 sigset_t sigset;
fac6795d 1199
1d4b027a 1200 if ((ret = sigemptyset(&sigset)) < 0) {
76d7553f 1201 PERROR("sigemptyset");
1d4b027a
DG
1202 return ret;
1203 }
d6f42150 1204
1d4b027a
DG
1205 sa.sa_mask = sigset;
1206 sa.sa_flags = 0;
0072e5e2
MD
1207
1208 sa.sa_handler = sighandler;
1d4b027a 1209 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
76d7553f 1210 PERROR("sigaction");
1d4b027a 1211 return ret;
d6f42150
DG
1212 }
1213
1d4b027a 1214 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
76d7553f 1215 PERROR("sigaction");
1d4b027a 1216 return ret;
d6f42150 1217 }
aaf26714 1218
0072e5e2 1219 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
76d7553f 1220 PERROR("sigaction");
1d4b027a 1221 return ret;
8c0faa1d
DG
1222 }
1223
0072e5e2
MD
1224 sa.sa_handler = SIG_IGN;
1225 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
0bb7724a
DG
1226 PERROR("sigaction");
1227 return ret;
1228 }
1229
1230 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
1d4b027a
DG
1231
1232 return ret;
fac6795d
DG
1233}
1234
f3ed775e 1235/*
d063d709 1236 * Set open files limit to unlimited. This daemon can open a large number of
514bb9f0 1237 * file descriptors in order to consume multiple kernel traces.
f3ed775e
DG
1238 */
1239static void set_ulimit(void)
1240{
1241 int ret;
1242 struct rlimit lim;
1243
514bb9f0 1244 /* The kernel does not allow an infinite limit for open files */
f3ed775e
DG
1245 lim.rlim_cur = 65535;
1246 lim.rlim_max = 65535;
1247
1248 ret = setrlimit(RLIMIT_NOFILE, &lim);
1249 if (ret < 0) {
76d7553f 1250 PERROR("failed to set open files limit");
f3ed775e
DG
1251 }
1252}
1253
4a15001e 1254static int write_pidfile(void)
35f90c40 1255{
412d7227 1256 return utils_create_pid_file(getpid(), the_config.pid_file_path.value);
35f90c40
DG
1257}
1258
e6142f2e
JG
1259static int set_clock_plugin_env(void)
1260{
1261 int ret = 0;
1262 char *env_value = NULL;
cd9290dd 1263
412d7227 1264 if (!the_config.lttng_ust_clock_plugin.value) {
e6142f2e
JG
1265 goto end;
1266 }
1267
3cfcd698 1268 ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
412d7227 1269 the_config.lttng_ust_clock_plugin.value);
cd9290dd 1270 if (ret < 0) {
e6142f2e
JG
1271 PERROR("asprintf");
1272 goto end;
cd9290dd
DG
1273 }
1274
e6142f2e
JG
1275 ret = putenv(env_value);
1276 if (ret) {
1277 free(env_value);
1278 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
1279 goto end;
1280 }
cd9290dd 1281
e6142f2e 1282 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
412d7227 1283 the_config.lttng_ust_clock_plugin.value);
e6142f2e 1284end:
4a15001e 1285 return ret;
ef367a93
JG
1286}
1287
99d688f2
JG
1288static void destroy_all_sessions_and_wait(void)
1289{
1290 struct ltt_session *session, *tmp;
1291 struct ltt_session_list *session_list;
1292
1293 session_list = session_get_list();
1294 DBG("Initiating destruction of all sessions");
1295
1296 if (!session_list) {
1297 return;
1298 }
1299
99d688f2
JG
1300 session_lock_list();
1301 /* Initiate the destruction of all sessions. */
1302 cds_list_for_each_entry_safe(session, tmp,
1303 &session_list->head, list) {
1304 if (!session_get(session)) {
1305 continue;
1306 }
1307
1308 session_lock(session);
1309 if (session->destroyed) {
1310 goto unlock_session;
1311 }
63763958 1312 (void) cmd_stop_trace(session);
412d7227
SM
1313 (void) cmd_destroy_session(
1314 session, the_notification_thread_handle, NULL);
99d688f2
JG
1315 unlock_session:
1316 session_unlock(session);
1317 session_put(session);
1318 }
1319 session_unlock_list();
1320
1321 /* Wait for the destruction of all sessions to complete. */
1322 DBG("Waiting for the destruction of all sessions to complete");
1323 session_list_wait_empty();
1324 DBG("Destruction of all sessions completed");
1325}
1326
b69a1b40
JG
1327static void unregister_all_triggers(void)
1328{
1329 enum lttng_error_code ret_code;
1330 enum lttng_trigger_status trigger_status;
1331 struct lttng_triggers *triggers = NULL;
1332 unsigned int trigger_count, i;
1333 const struct lttng_credentials creds = {
e534f206 1334 .uid = LTTNG_OPTIONAL_INIT_VALUE(0),
b69a1b40
JG
1335 };
1336
1337 DBG("Unregistering all triggers");
1338
1339 /*
1340 * List all triggers as "root" since we wish to unregister all triggers.
1341 */
1342 ret_code = notification_thread_command_list_triggers(
412d7227
SM
1343 the_notification_thread_handle, creds.uid.value,
1344 &triggers);
b69a1b40
JG
1345 if (ret_code != LTTNG_OK) {
1346 ERR("Failed to list triggers while unregistering all triggers");
1347 goto end;
1348 }
1349
1350 trigger_status = lttng_triggers_get_count(triggers, &trigger_count);
1351 assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
1352
1353 for (i = 0; i < trigger_count; i++) {
b69a1b40
JG
1354 uid_t trigger_owner;
1355 const char *trigger_name;
1356 const struct lttng_trigger *trigger =
1357 lttng_triggers_get_at_index(triggers, i);
1358
1359 assert(trigger);
1360
1361 trigger_status = lttng_trigger_get_owner_uid(
1362 trigger, &trigger_owner);
1363 assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
1364
1365 trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
0efb2ad7
JG
1366 trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
1367 trigger_name : "(anonymous)";
b69a1b40
JG
1368
1369 DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'",
1370 (int) trigger_owner, trigger_name);
1371
412d7227
SM
1372 ret_code = cmd_unregister_trigger(&creds, trigger,
1373 the_notification_thread_handle);
b69a1b40
JG
1374 if (ret_code != LTTNG_OK) {
1375 ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'",
1376 (int) trigger_owner, trigger_name,
1377 lttng_strerror(-ret_code));
1378 /* Continue to unregister the remaining triggers. */
1379 }
1380 }
1381end:
1382 lttng_triggers_destroy(triggers);
1383}
1384
929f71ec
JG
1385static int run_as_worker_post_fork_cleanup(void *data)
1386{
1387 struct sessiond_config *sessiond_config = data;
1388
1389 sessiond_config_fini(sessiond_config);
1390 return 0;
1391}
1392
1393static int launch_run_as_worker(const char *procname)
1394{
1395 /*
1396 * Clean-up before forking the run-as worker. Any dynamically
1397 * allocated memory of which the worker is not aware will
1398 * be leaked as the process forks a run-as worker (and performs
1399 * no exec*()). The same would apply to any opened fd.
1400 */
412d7227
SM
1401 return run_as_create_worker(
1402 procname, run_as_worker_post_fork_cleanup, &the_config);
929f71ec
JG
1403}
1404
52a0e931
JG
1405static void sessiond_uuid_log(void)
1406{
c70636a7 1407 char uuid_str[LTTNG_UUID_STR_LEN];
52a0e931 1408
412d7227 1409 lttng_uuid_to_str(the_sessiond_uuid, uuid_str);
52a0e931
JG
1410 DBG("Starting lttng-sessiond {%s}", uuid_str);
1411}
1412
fac6795d
DG
1413/*
1414 * main
1415 */
1416int main(int argc, char **argv)
1417{
4a15001e 1418 int ret = 0, retval = 0;
e6142f2e 1419 const char *env_app_timeout;
b3530820
JG
1420 struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
1421 *ust64_channel_monitor_pipe = NULL,
1422 *kernel_channel_monitor_pipe = NULL;
a3707772 1423 struct lttng_thread *ht_cleanup_thread = NULL;
bc26e826 1424 struct timer_thread_parameters timer_thread_parameters;
64d9b072
JG
1425 /* Rotation thread handle. */
1426 struct rotation_thread_handle *rotation_thread_handle = NULL;
d086f507
JD
1427 /* Queue of rotation jobs populated by the sessiond-timer. */
1428 struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
917a718d 1429 struct lttng_thread *client_thread = NULL;
4a91420c 1430 struct lttng_thread *notification_thread = NULL;
bd9addf7 1431 struct lttng_thread *register_apps_thread = NULL;
761ffce2 1432 enum event_notifier_error_accounting_status event_notifier_error_accounting_status;
fac6795d 1433
f5fb86c1 1434 logger_set_thread_name("Main", false);
335a95b7
MD
1435 init_kernel_workarounds();
1436
f6a9efaa
DG
1437 rcu_register_thread();
1438
4a15001e
MD
1439 if (set_signal_handler()) {
1440 retval = -1;
1441 goto exit_set_signal_handler;
0bb7724a
DG
1442 }
1443
92816cc3 1444 if (timer_signal_init()) {
d086f507
JD
1445 retval = -1;
1446 goto exit_set_signal_handler;
1447 }
1448
412d7227
SM
1449 the_page_size = sysconf(_SC_PAGESIZE);
1450 if (the_page_size < 0) {
12744796 1451 PERROR("sysconf _SC_PAGESIZE");
412d7227
SM
1452 the_page_size = LONG_MAX;
1453 WARN("Fallback page size to %ld", the_page_size);
12744796
DG
1454 }
1455
412d7227 1456 ret = sessiond_config_init(&the_config);
e6142f2e
JG
1457 if (ret) {
1458 retval = -1;
1459 goto exit_set_signal_handler;
1460 }
1461
2788b494
JR
1462 /*
1463 * Init config from environment variables.
1464 * Command line option override env configuration per-doc. Do env first.
1465 */
412d7227 1466 sessiond_config_apply_env_config(&the_config);
2788b494 1467
4a15001e
MD
1468 /*
1469 * Parse arguments and load the daemon configuration file.
1470 *
1471 * We have an exit_options exit path to free memory reserved by
1472 * set_options. This is needed because the rest of sessiond_cleanup()
1473 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
1474 * depends on set_options.
1475 */
fac6795d 1476 progname = argv[0];
4a15001e
MD
1477 if (set_options(argc, argv)) {
1478 retval = -1;
1479 goto exit_options;
fac6795d
DG
1480 }
1481
e6142f2e
JG
1482 /*
1483 * Resolve all paths received as arguments, configuration option, or
1484 * through environment variable as absolute paths. This is necessary
1485 * since daemonizing causes the sessiond's current working directory
1486 * to '/'.
1487 */
412d7227 1488 ret = sessiond_config_resolve_paths(&the_config);
e6142f2e
JG
1489 if (ret) {
1490 goto exit_options;
1491 }
1492
1493 /* Apply config. */
412d7227
SM
1494 lttng_opt_verbose = the_config.verbose;
1495 lttng_opt_quiet = the_config.quiet;
1496 the_kconsumer_data.err_unix_sock_path =
1497 the_config.kconsumerd_err_unix_sock_path.value;
1498 the_kconsumer_data.cmd_unix_sock_path =
1499 the_config.kconsumerd_cmd_unix_sock_path.value;
1500 the_ustconsumer32_data.err_unix_sock_path =
1501 the_config.consumerd32_err_unix_sock_path.value;
1502 the_ustconsumer32_data.cmd_unix_sock_path =
1503 the_config.consumerd32_cmd_unix_sock_path.value;
1504 the_ustconsumer64_data.err_unix_sock_path =
1505 the_config.consumerd64_err_unix_sock_path.value;
1506 the_ustconsumer64_data.cmd_unix_sock_path =
1507 the_config.consumerd64_cmd_unix_sock_path.value;
e6142f2e
JG
1508 set_clock_plugin_env();
1509
412d7227 1510 sessiond_config_log(&the_config);
52a0e931 1511 sessiond_uuid_log();
e6142f2e 1512
a3bc3918
JR
1513 if (opt_print_version) {
1514 print_version();
1515 retval = 0;
1516 goto exit_options;
1517 }
1518
f472090a
JG
1519 if (create_lttng_rundir()) {
1520 retval = -1;
1521 goto exit_options;
1522 }
1523
1524 /* Abort launch if a session daemon is already running. */
1525 if (check_existing_daemon()) {
1526 ERR("A session daemon is already running.");
1527 retval = -1;
1528 goto exit_options;
1529 }
1530
fac6795d 1531 /* Daemonize */
412d7227 1532 if (the_config.daemonize || the_config.background) {
ceed52b5
MD
1533 int i;
1534
412d7227
SM
1535 ret = lttng_daemonize(&the_child_ppid, &recv_child_signal,
1536 !the_config.background);
53094c05 1537 if (ret < 0) {
4a15001e
MD
1538 retval = -1;
1539 goto exit_options;
53094c05 1540 }
0bb7724a 1541
ceed52b5 1542 /*
0bb7724a 1543 * We are in the child. Make sure all other file descriptors are
4a15001e 1544 * closed, in case we are called with more opened file
f472090a 1545 * descriptors than the standard ones and the lock file.
ceed52b5
MD
1546 */
1547 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
f472090a
JG
1548 if (i == lockfile_fd) {
1549 continue;
1550 }
ceed52b5
MD
1551 (void) close(i);
1552 }
1553 }
1554
929f71ec 1555 if (launch_run_as_worker(argv[0]) < 0) {
7567352f
MD
1556 goto exit_create_run_as_worker_cleanup;
1557 }
1558
4a15001e
MD
1559 /*
1560 * Starting from here, we can create threads. This needs to be after
1561 * lttng_daemonize due to RCU.
1562 */
1563
1564 /*
1565 * Initialize the health check subsystem. This call should set the
1566 * appropriate time values.
1567 */
412d7227
SM
1568 the_health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
1569 if (!the_health_sessiond) {
4a15001e
MD
1570 PERROR("health_app_create error");
1571 retval = -1;
0d64e8fb 1572 goto stop_threads;
4a15001e
MD
1573 }
1574
4a15001e 1575 /* Create thread to clean up RCU hash tables */
a3707772
JG
1576 ht_cleanup_thread = launch_ht_cleanup_thread();
1577 if (!ht_cleanup_thread) {
4a15001e 1578 retval = -1;
0d64e8fb 1579 goto stop_threads;
4a15001e
MD
1580 }
1581
ceed52b5 1582 /* Create thread quit pipe */
a7333da7 1583 if (sessiond_init_thread_quit_pipe()) {
4a15001e 1584 retval = -1;
0d64e8fb 1585 goto stop_threads;
fac6795d
DG
1586 }
1587
1588 /* Check if daemon is UID = 0 */
1589 is_root = !getuid();
fac6795d 1590 if (is_root) {
67e40797 1591 /* Create global run dir with root access */
67e40797 1592
b3530820
JG
1593 kernel_channel_monitor_pipe = lttng_pipe_open(0);
1594 if (!kernel_channel_monitor_pipe) {
1595 ERR("Failed to create kernel consumer channel monitor pipe");
1596 retval = -1;
0d64e8fb 1597 goto stop_threads;
b3530820 1598 }
412d7227 1599 the_kconsumer_data.channel_monitor_pipe =
b3530820 1600 lttng_pipe_release_writefd(
412d7227
SM
1601 kernel_channel_monitor_pipe);
1602 if (the_kconsumer_data.channel_monitor_pipe < 0) {
b3530820 1603 retval = -1;
0d64e8fb 1604 goto stop_threads;
b3530820 1605 }
fac6795d
DG
1606 }
1607
5c827ce0 1608 /* Set consumer initial state */
412d7227
SM
1609 the_kernel_consumerd_state = CONSUMER_STOPPED;
1610 the_ust_consumerd_state = CONSUMER_STOPPED;
5c827ce0 1611
b3530820
JG
1612 ust32_channel_monitor_pipe = lttng_pipe_open(0);
1613 if (!ust32_channel_monitor_pipe) {
1614 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
1615 retval = -1;
0d64e8fb 1616 goto stop_threads;
b3530820 1617 }
412d7227
SM
1618 the_ustconsumer32_data.channel_monitor_pipe =
1619 lttng_pipe_release_writefd(ust32_channel_monitor_pipe);
1620 if (the_ustconsumer32_data.channel_monitor_pipe < 0) {
b3530820 1621 retval = -1;
0d64e8fb 1622 goto stop_threads;
b3530820 1623 }
62c43103 1624
d086f507 1625 /*
92816cc3
JG
1626 * The rotation_thread_timer_queue structure is shared between the
1627 * sessiond timer thread and the rotation thread. The main thread keeps
1628 * its ownership and destroys it when both threads have been joined.
d086f507 1629 */
92816cc3 1630 rotation_timer_queue = rotation_thread_timer_queue_create();
d086f507
JD
1631 if (!rotation_timer_queue) {
1632 retval = -1;
0d64e8fb 1633 goto stop_threads;
d086f507 1634 }
bc26e826
JG
1635 timer_thread_parameters.rotation_thread_job_queue =
1636 rotation_timer_queue;
67e40797 1637
b3530820
JG
1638 ust64_channel_monitor_pipe = lttng_pipe_open(0);
1639 if (!ust64_channel_monitor_pipe) {
1640 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
1641 retval = -1;
0d64e8fb 1642 goto stop_threads;
b3530820 1643 }
412d7227
SM
1644 the_ustconsumer64_data.channel_monitor_pipe =
1645 lttng_pipe_release_writefd(ust64_channel_monitor_pipe);
1646 if (the_ustconsumer64_data.channel_monitor_pipe < 0) {
b3530820 1647 retval = -1;
0d64e8fb 1648 goto stop_threads;
b3530820 1649 }
847177cd 1650
1427f9b2
DG
1651 /*
1652 * Init UST app hash table. Alloc hash table before this point since
1653 * cleanup() can get called after that point.
1654 */
4a15001e 1655 if (ust_app_ht_alloc()) {
ddbeb0f6 1656 ERR("Failed to allocate UST app hash table");
4a15001e 1657 retval = -1;
0d64e8fb 1658 goto stop_threads;
4a15001e 1659 }
1427f9b2 1660
761ffce2
FD
1661 event_notifier_error_accounting_status = event_notifier_error_accounting_init(
1662 the_config.event_notifier_buffer_size_kernel,
1663 the_config.event_notifier_buffer_size_userspace);
1664 if (event_notifier_error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
1665 ERR("Failed to initialize event notifier error accounting system");
1666 retval = -1;
1667 goto stop_threads;
1668 }
90aa04a1 1669
6a4e4039
JG
1670 /*
1671 * Initialize agent app hash table. We allocate the hash table here
1672 * since cleanup() can get called after this point.
1673 */
1674 if (agent_app_ht_alloc()) {
1675 ERR("Failed to allocate Agent app hash table");
4a15001e 1676 retval = -1;
0d64e8fb 1677 goto stop_threads;
f20baf8e
DG
1678 }
1679
44760c20
JR
1680 if (agent_by_event_notifier_domain_ht_create()) {
1681 ERR("Failed to allocate per-event notifier domain agent hash table");
1682 retval = -1;
1683 goto stop_threads;
1684 }
a88df331
DG
1685 /*
1686 * These actions must be executed as root. We do that *after* setting up
1687 * the sockets path because we MUST make the check for another daemon using
1688 * those paths *before* trying to set the kernel consumer sockets and init
1689 * kernel tracer.
1690 */
1691 if (is_root) {
412d7227 1692 if (set_consumer_sockets(&the_kconsumer_data)) {
4a15001e 1693 retval = -1;
0d64e8fb 1694 goto stop_threads;
7753dea8
MD
1695 }
1696
a88df331 1697 /* Setup kernel tracer */
412d7227 1698 if (!the_config.no_kernel) {
4fba7219
DG
1699 init_kernel_tracer();
1700 }
a88df331
DG
1701
1702 /* Set ulimit for open files */
1703 set_ulimit();
fac6795d 1704 }
4063050c
MD
1705 /* init lttng_fd tracking must be done after set_ulimit. */
1706 lttng_fd_init();
fac6795d 1707
412d7227 1708 if (set_consumer_sockets(&the_ustconsumer64_data)) {
4a15001e 1709 retval = -1;
0d64e8fb 1710 goto stop_threads;
67e40797
DG
1711 }
1712
412d7227 1713 if (set_consumer_sockets(&the_ustconsumer32_data)) {
4a15001e 1714 retval = -1;
0d64e8fb 1715 goto stop_threads;
67e40797
DG
1716 }
1717
5b8719f5 1718 /* Get parent pid if -S, --sig-parent is specified. */
412d7227
SM
1719 if (the_config.sig_parent) {
1720 the_ppid = getppid();
5b8719f5
DG
1721 }
1722
7a485870 1723 /* Setup the kernel pipe for waking up the kernel thread */
412d7227
SM
1724 if (is_root && !the_config.no_kernel) {
1725 if (utils_create_pipe_cloexec(the_kernel_poll_pipe)) {
4a15001e 1726 retval = -1;
0d64e8fb 1727 goto stop_threads;
6620da75 1728 }
7a485870
DG
1729 }
1730
099e26bd 1731 /* Setup the thread apps communication pipe. */
4a15001e
MD
1732 if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
1733 retval = -1;
0d64e8fb 1734 goto stop_threads;
099e26bd
DG
1735 }
1736
d0b96690 1737 /* Setup the thread apps notify communication pipe. */
4a15001e
MD
1738 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
1739 retval = -1;
0d64e8fb 1740 goto stop_threads;
d0b96690
DG
1741 }
1742
7972aab2
DG
1743 /* Initialize global buffer per UID and PID registry. */
1744 buffer_reg_init_uid_registry();
1745 buffer_reg_init_pid_registry();
1746
099e26bd 1747 /* Init UST command queue. */
8bdee6e2 1748 cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
099e26bd 1749
2f77fc4b 1750 cmd_init();
00e2e675 1751
ae9e45b3
DG
1752 /* Check for the application socket timeout env variable. */
1753 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
1754 if (env_app_timeout) {
412d7227 1755 the_config.app_socket_timeout = atoi(env_app_timeout);
ae9e45b3 1756 } else {
412d7227 1757 the_config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
ae9e45b3
DG
1758 }
1759
4a15001e
MD
1760 ret = write_pidfile();
1761 if (ret) {
1762 ERR("Error in write_pidfile");
1763 retval = -1;
0d64e8fb 1764 goto stop_threads;
4a15001e 1765 }
35f90c40 1766
554831e7
MD
1767 /* Initialize communication library */
1768 lttcomm_init();
4a15001e 1769 /* Initialize TCP timeout values */
d831c249 1770 lttcomm_inet_init();
554831e7 1771
12b4fb37 1772 /* Create health-check thread. */
173fca4f 1773 if (!launch_health_management_thread()) {
4a15001e 1774 retval = -1;
0d64e8fb 1775 goto stop_threads;
44a5e5eb
DG
1776 }
1777
b3530820 1778 /* notification_thread_data acquires the pipes' read side. */
412d7227
SM
1779 the_notification_thread_handle = notification_thread_handle_create(
1780 ust32_channel_monitor_pipe, ust64_channel_monitor_pipe,
c8a9de5a 1781 kernel_channel_monitor_pipe);
412d7227 1782 if (!the_notification_thread_handle) {
b3530820
JG
1783 retval = -1;
1784 ERR("Failed to create notification thread shared data");
0d64e8fb 1785 goto stop_threads;
b3530820
JG
1786 }
1787
1788 /* Create notification thread. */
4a91420c 1789 notification_thread = launch_notification_thread(
412d7227 1790 the_notification_thread_handle);
4a91420c 1791 if (!notification_thread) {
b3530820 1792 retval = -1;
0d64e8fb 1793 goto stop_threads;
b3530820
JG
1794 }
1795
d086f507 1796 /* Create timer thread. */
bc26e826 1797 if (!launch_timer_thread(&timer_thread_parameters)) {
d086f507 1798 retval = -1;
0d64e8fb 1799 goto stop_threads;
d086f507 1800 }
d086f507 1801
db66e574
JD
1802 /* rotation_thread_data acquires the pipes' read side. */
1803 rotation_thread_handle = rotation_thread_handle_create(
412d7227 1804 rotation_timer_queue, the_notification_thread_handle);
db66e574
JD
1805 if (!rotation_thread_handle) {
1806 retval = -1;
1807 ERR("Failed to create rotation thread shared data");
1808 stop_threads();
0d64e8fb 1809 goto stop_threads;
db66e574 1810 }
db66e574
JD
1811
1812 /* Create rotation thread. */
64d9b072 1813 if (!launch_rotation_thread(rotation_thread_handle)) {
db66e574 1814 retval = -1;
0d64e8fb 1815 goto stop_threads;
db66e574
JD
1816 }
1817
cf3af59e 1818 /* Create thread to manage the client socket */
917a718d
JG
1819 client_thread = launch_client_thread();
1820 if (!client_thread) {
4a15001e 1821 retval = -1;
0d64e8fb 1822 goto stop_threads;
cf3af59e 1823 }
fac6795d 1824
308df7bb 1825 /* Set credentials of the client socket and rundir */
412d7227 1826 if (is_root && set_permissions(the_config.rundir.value)) {
308df7bb
JG
1827 retval = -1;
1828 goto stop_threads;
1829 }
1830
5d1b0219
JG
1831 if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1],
1832 apps_cmd_notify_pipe[1])) {
4a15001e 1833 retval = -1;
0d64e8fb 1834 goto stop_threads;
099e26bd
DG
1835 }
1836
1837 /* Create thread to manage application registration. */
bd9addf7
JG
1838 register_apps_thread = launch_application_registration_thread(
1839 &ust_cmd_queue);
1840 if (!register_apps_thread) {
4a15001e 1841 retval = -1;
0d64e8fb 1842 goto stop_threads;
099e26bd
DG
1843 }
1844
cf3af59e 1845 /* Create thread to manage application socket */
7649924e 1846 if (!launch_application_management_thread(apps_cmd_pipe[0])) {
4a15001e 1847 retval = -1;
0d64e8fb 1848 goto stop_threads;
d0b96690
DG
1849 }
1850
1851 /* Create thread to manage application notify socket */
971a61c6 1852 if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) {
4a15001e 1853 retval = -1;
0d64e8fb 1854 goto stop_threads;
cf3af59e 1855 }
fac6795d 1856
8a7e4590
JG
1857 /* Create agent management thread. */
1858 if (!launch_agent_management_thread()) {
4a15001e 1859 retval = -1;
0d64e8fb 1860 goto stop_threads;
4d076222
DG
1861 }
1862
6620da75 1863 /* Don't start this thread if kernel tracing is not requested nor root */
412d7227 1864 if (is_root && !the_config.no_kernel) {
6620da75 1865 /* Create kernel thread to manage kernel event */
412d7227 1866 if (!launch_kernel_management_thread(the_kernel_poll_pipe[0])) {
4a15001e 1867 retval = -1;
0d64e8fb 1868 goto stop_threads;
6620da75 1869 }
352b58f5
JR
1870
1871 if (kernel_get_notification_fd() >= 0) {
1872 ret = notification_thread_command_add_tracer_event_source(
412d7227 1873 the_notification_thread_handle,
352b58f5
JR
1874 kernel_get_notification_fd(),
1875 LTTNG_DOMAIN_KERNEL);
1876 if (ret != LTTNG_OK) {
1877 ERR("Failed to add kernel trigger event source to notification thread");
1878 retval = -1;
1879 goto stop_threads;
1880 }
1881 }
ef367a93 1882 }
7a485870 1883
3316b9d6 1884 /* Load sessions. */
412d7227
SM
1885 ret = config_load_session(
1886 the_config.load_session_path.value, NULL, 1, 1, NULL);
4a15001e 1887 if (ret) {
3316b9d6 1888 ERR("Session load failed: %s", error_get_str(ret));
4a15001e 1889 retval = -1;
0d64e8fb 1890 goto stop_threads;
4a15001e
MD
1891 }
1892
3316b9d6
JG
1893 /* Initialization completed. */
1894 sessiond_signal_parents();
1895
4a15001e
MD
1896 /*
1897 * This is where we start awaiting program completion (e.g. through
1898 * signal that asks threads to teardown).
1899 */
1900
99d688f2 1901 /* Initiate teardown once activity occurs on the quit pipe. */
2d54bfb6 1902 sessiond_wait_for_quit_pipe(-1);
917a718d 1903
0d64e8fb 1904stop_threads:
90aa04a1 1905
917a718d
JG
1906 /*
1907 * Ensure that the client thread is no longer accepting new commands,
1908 * which could cause new sessions to be created.
1909 */
0d64e8fb
JG
1910 if (client_thread) {
1911 lttng_thread_shutdown(client_thread);
917a718d 1912 lttng_thread_put(client_thread);
917a718d
JG
1913 }
1914
99d688f2 1915 destroy_all_sessions_and_wait();
0d64e8fb 1916
b69a1b40
JG
1917 /*
1918 * At this point no new trigger can be registered (no sessions are
1919 * running/rotating) and clients can't connect to the session daemon
1920 * anymore. Unregister all triggers.
1921 */
1922 unregister_all_triggers();
1923
bd9addf7
JG
1924 if (register_apps_thread) {
1925 lttng_thread_shutdown(register_apps_thread);
1926 lttng_thread_put(register_apps_thread);
1927 }
a3707772 1928 lttng_thread_list_shutdown_orphans();
917a718d 1929
4d62fbf8
MD
1930 /*
1931 * Wait for all pending call_rcu work to complete before tearing
1932 * down data structures. call_rcu worker may be trying to
1933 * perform lookups in those structures.
1934 */
1935 rcu_barrier();
4a15001e
MD
1936 /*
1937 * sessiond_cleanup() is called when no other thread is running, except
1938 * the ht_cleanup thread, which is needed to destroy the hash tables.
1939 */
1940 rcu_thread_online();
1941 sessiond_cleanup();
06f525de 1942
3b8a092f 1943 /*
1d25334c 1944 * Wait for all pending call_rcu work to complete before shutting down
3b8a092f
FD
1945 * the notification thread. This call_rcu work includes shutting down
1946 * UST apps and event notifier pipes.
1947 */
1948 rcu_barrier();
1949
4a91420c
JG
1950 if (notification_thread) {
1951 lttng_thread_shutdown(notification_thread);
1952 lttng_thread_put(notification_thread);
1953 }
1954
90aa04a1 1955 /*
1d25334c
FD
1956 * Error accounting teardown has to be done after the teardown of all
1957 * event notifier pipes to ensure that no tracer may try to use the
1958 * error accounting facilities.
90aa04a1
FD
1959 */
1960 event_notifier_error_accounting_fini();
1961
1d25334c
FD
1962 /*
1963 * Unloading the kernel modules needs to be done after all kernel
1964 * ressources have been released. In our case, this includes the
1965 * notification fd, the event notifier group fd, error accounting fd,
1966 * all event and event notifier fds, etc.
1967 *
1968 * In short, at this point, we need to have called close() on all fds
1969 * received from the kernel tracer.
1970 */
412d7227 1971 if (is_root && !the_config.no_kernel) {
1d25334c
FD
1972 DBG("Unloading kernel modules");
1973 modprobe_remove_lttng_all();
1974 }
1975
c4d5de9d
JG
1976 /*
1977 * Ensure all prior call_rcu are done. call_rcu callbacks may push
1978 * hash tables to the ht_cleanup thread. Therefore, we ensure that
1979 * the queue is empty before shutting down the clean-up thread.
1980 */
1981 rcu_barrier();
1982
a3707772
JG
1983 if (ht_cleanup_thread) {
1984 lttng_thread_shutdown(ht_cleanup_thread);
1985 lttng_thread_put(ht_cleanup_thread);
1986 }
1987
64d9b072
JG
1988 rcu_thread_offline();
1989 rcu_unregister_thread();
1990
1991 if (rotation_thread_handle) {
1992 rotation_thread_handle_destroy(rotation_thread_handle);
1993 }
1994
d086f507
JD
1995 /*
1996 * After the rotation and timer thread have quit, we can safely destroy
1997 * the rotation_timer_queue.
1998 */
92816cc3 1999 rotation_thread_timer_queue_destroy(rotation_timer_queue);
c8a9de5a
JG
2000 /*
2001 * The teardown of the notification system is performed after the
2002 * session daemon's teardown in order to allow it to be notified
2003 * of the active session and channels at the moment of the teardown.
2004 */
412d7227
SM
2005 if (the_notification_thread_handle) {
2006 notification_thread_handle_destroy(
2007 the_notification_thread_handle);
c8a9de5a 2008 }
b3530820
JG
2009 lttng_pipe_destroy(ust32_channel_monitor_pipe);
2010 lttng_pipe_destroy(ust64_channel_monitor_pipe);
2011 lttng_pipe_destroy(kernel_channel_monitor_pipe);
4a15001e 2012
412d7227
SM
2013 if (the_health_sessiond) {
2014 health_app_destroy(the_health_sessiond);
9bc2ec5f 2015 }
7567352f 2016exit_create_run_as_worker_cleanup:
4a15001e 2017exit_options:
f472090a 2018 sessiond_cleanup_lock_file();
4a15001e
MD
2019 sessiond_cleanup_options();
2020
2021exit_set_signal_handler:
2022 if (!retval) {
cf3af59e 2023 exit(EXIT_SUCCESS);
4a15001e
MD
2024 } else {
2025 exit(EXIT_FAILURE);
67e40797 2026 }
fac6795d 2027}
This page took 0.386391 seconds and 4 git commands to generate.